MY99 UK car, FSSH, 64k miles, last serviced at 60k, use 95ron NUL, owned it for 14 months, suspect flats spots always been there, just taken a while to pin down a pattern.

Flat spot only apparent in 2nd when been in 2nd fer 5 or so seconds previously (eg slowing down to a roundabout, hanging in 2nd before accelerating away) - just runs out of steam at 4k revs and have to change up.

If changing from first and accelerating thru the gears, no problems at all. Just apparent when hanging in 2nd for a little while before puttin my foot down.

Any advice appreciated.

 

Sorry... You're stuck with it, unless you get a new ECU upgrade!

It's a fiddle by Subaru to get thru drive by noise emissions regulations or something like that.

The ECU belives by staying in 2nd like that, that you're about to do the test! Robs you of power and thus extra noise. Learn to drive around it. take foot off the gas completely and stomp back on again, etc.

IIRC...

 

Have you tried running it on Optimax or SUL. Maybe that would help.

My MY98 is a lot more responsive running Optimax

 

cheers squizz - thought it must be sommat like that. dont think there's owt wrong with the car

danny boy - not tried optimax. did a trial between super and nul when i first got it and couldnt see any difference. a few optimax threads on here have put me off....

 

to answer my own question - looks to be a feature:-

http://www.scoobynet.co.uk/bbs/threa...ThreadID=69723

 

Riftzone
You need to reset the ecu to feel the difference when changing up to optimax. This can be done by leaving the battery disconnected for a few hours, or connecting the wires under the steering column together. I have a MY99 and you will feel the difference. Do a search on ECU reset. It also runs more smoother.

 

Never found this to be necessary.

MY99 should learn upwards over short period of time However happy to be corrected if someone 100% certain on this one

Cheers


[Edited by SiPie - 6/6/2003 12:38:20 PM]

 

As SiPie says it will learn, but to feel the difference straight away rather than let the ECU adapt, a reset will give you this.
If you have had any Knock correction stored away in the ECU, from Det caused by poor fuel, this will reset this back to factory default settings.

 

Cheers Eprom

Have noticed that it can take a while and I've found it can get a little confused when throwing heaps of NF octane booster in

 

resets won't really help.

It is a design feature on MY99's (maybe on others but I'm not sure)

Still, rest assured you got a better ECU map than MY00 cars

D